.header-container{
    width: 1200px;
    margin: 0 auto;
    ul{
        display: flex;
        list-style: none;
        justify-content: space-around;
    }
}
a{
    text-decoration:none;
    font-size: 20px;
    color: #333;
}
a:hover{
    color: red;
}
a.active{
    color: red;
}